Graphics Reference
In-Depth Information
Digits : 1-2 3-4 5-6 7-8
æææææææææææææææææææææææææææææææææææææææ
Meaning:
Blank status
Subordinate entity switch Entity use flag
Hierarchy
00 visible
00 independent
00 geometry
00 Global top down
01 blanked
01 physically dependent 01 annotation
01 Global defer
02 logically dependent 02 definition
02 Use hierarchy
03 both (01) and (02) 03 other
property
04 logical
Figure C.3.
The Directory Entry Status field.
Figure C.4.
The Parameter Data Section for one entity.
Form Number.
Some entities have different interpretations. The interpretation
numbers are specified in the entity descriptions. In our file, entity 106 specified
interpretation 2, which means that data points are presented as coordinate triples.
Parameter Data Section.
This section contains the data associated to each entity.
The data is entered in free format on each line in columns 1-64, except that the first
field of the first line of data for an entity must be the entity type number. For example,
in our file note the number 124 at the beginning of the first line of the parameter data
section indicating that this is data for some entity of type 124 that was specified in
the directory entry section. Column 65 should be blank. Columns 66-72 on each
parameter data line contains the sequence number of the directory entity that uses
this data. In our file, note the number 1 in the first three lines of the parameter data
section. Two groups of parameters can come at the end of the specified parameters
for each entity unless the record delimiter appears first. The first group of parameters
may contain pointers to associativity instances, general notes, and/or text template
entities. The second group of parameters may contain pointers to one or more prop-
erties. For example, see parameters 8 to 9 + n + m for arc entity number 100 in Figure
C.6. Section C.4 will explain these extra parameters more. Any desired comments may
be added after the record delimiter and these can run over several lines. See Figure
C.4 for an outline of the structure of the parameter data section.
